She boarded a British Airways flight the following day.
She was arrested twice in two days in July 2015 for attempting to sneak through airports without a valid ticket.
Hartman got past TSA screening at a domestic checkpoint at Chicago O'Hare, then took a shuttle to the global terminal. Media outlets have also called her a homeless loner bouncing between women's shelters and motel rooms up and down the West Coast over the past decade.
According to a Chicago Tribune report, Hartmann now faces a felony theft charge (the ticket would have cost $2,400) and a misdemeanour trespass charge.
More recently, Hartman spent a year in Cook County Jail after repeated episodes of attempting to board aircraft at O'Hare and Midway global airports, according to CBS Chicago.
Hartman, of Grayslake, Ill., was flown back to O'Hare and Chicago police and other officials were waiting for her when she arrived, prosecutors said.
Hartman reportedly said she "may have" boarded aircrafts without a ticket eight times, the report said.
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Aubameyang, meanwhile, was spotted on Friday playing a five-a-side match in a Dortmund football hall wearing Ousmane Dembele's jersey.
The US Transportation Security Administration is investigating how she keeps managing to sneak past customs staff.
The Chicago Department of Aviation released a statement, advising that no passengers had been put at risk by the episode.
The TSA is no match for Marilyn Hartman.
Hartman was living at an apartment facility for low-income seniors at a Chicago suburb before her arrest this week. "During the initial investigation it was determined that the passenger was screened at the security checkpoint before boarding a flight".
Instead, the agency released a statement saying, "This matter is subject to an ongoing investigation and TSA is working closely with our law enforcement and airline partners in that effort", according to the Chicago Tribune. The judge dished out a harsh scolding as he recounted Hartman's history, which included several attempts to escape from mental-health facilities in IL.
"High definition video captured the defendant's movements throughout O'Hare Airport", Assistant State's Attorney Maria McCarthy said.
She will appear in court on Saturday.
Prosecutors say Hartman put her bag on the screening device, passed security and got in line for a flight to CT.